The problem is not necessarily the range but rather that it's not logarithmic. However, this will not change until there will be major redesign of the MPTM format.

Also, I hope you are aware that there are already volume slide commands which are basically the equivalent to smooth MIDI macros (executed once every tick).
You can also experiment by increasing the ramp-up and ramp-down values in the mixer settings but then many songs will sound muddy (it's hard to tell when a big volume jump is intended and when it's supposed to be smooth).

Logarithmic? I don't think that is a good idea. The volume scale (without any logarithmic/exponential modifications) should be used.

But Milkytracker sound more smooth.

I thought of this topic today, but as the idea of having a smooth volume command in the volume-column in the .mptm-format rather than as a option in the module-properties.

v00 v64 consecutively will make the volume jump straight to 64
w00 w64 consecutively will make the volume slide to 64 in resolution of ticks/row

Any command that uses tick resolution will not have any improvements over existing slide commands though, except that you don't have to calculate the slide speed in your head. If we really want to introduce something new and better here, it shouldn't be restricted to ticks.

...true. If that's how the smooth-macro/PC commands works, then it may be the same with smooth-volume.